How I back up my stock, unrooted Galaxy Nexus

I get this question a lot: If my Galaxy Nexus is unrooted and running the stock ROM, how do I back up it via a custom recovery?
It's pretty easy, actually, and it goes back to our method of manually applying a stock update. You're going to need a few things (and chances are you've got them already):

In the command line, type fastboot boot xxxxxxx.img (where xxxxxxx is the name of the custom recovery you saved).

And that's it. You'll have booted into the custom recovery, and from there you can do a full backup, or restore a backup, or wipe the phone. All without rewriting anything. If you need a little more hand-holding, there's some video after the break.

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